垂体在内分泌生理中占有枢纽地位，其主要原因是垂体（） A

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问题选择题

垂体在内分泌生理中占有枢纽地位，其主要原因是垂体（　　）

A．由腺细胞构成

B．能分泌生长素

C．能分泌多种促激素

D．与大脑有联系

答案

激素是由内分泌腺分泌的，对人体有特殊作用的化学物质．垂体不但分泌生长激素，而且能分泌促激素，如促甲状腺激素和促性腺激素等；生长激素是由大脑下方的垂体分泌的．生长激素有促进动物生长的作用．

故选：C

阅读理解

阅读短文，选择正确的答案。将其编号写在题前的括号里。

Hi, I'm Lily. I'm from Canada. But now I'm studying in China. I'm a university student. Tomorrow is

Christmas Day. I'm going to buy many gifts for the happy day in the supermarket this afternoon. Next week,

I'm going to take a trip. I'm going to see the snow. I like snow. I can ski. I'm going there with my classmates

by plane. We are going to have a nice trip.

1. Lily is from .[ ]

A. Canada

B. England

C. China

2. It's now in China.[ ]

A. spring

B. summer

C. winter

3. Lily is going to in the supermarket.[ ]

A. take a trip

B. go shopping

C. collect stamps

4. Lily is going to the of China next week.[ ]

A. south

B. east

C. north

5. Lily and her classmates are going to take the to Harbin.[ ]

A. plane

B. train

C. subway

单项选择题

关于条码识读技术和射频识读技术(RFID)，下列说法正确的是______。

A．他们一次都只能识读一个标签
B．他们一次都能同时识读数个标签
C．条码阅读器一次只能识读一个条码标签，RFID辨识器可同时识读数个RFID标签
D．条码阅读器可同时识读数个条码标签，RFID辨识器一次只能识读一个RFID标签